Page "Duke of Marlborough (title)" Paragraph 2

The first duke was also honoured with Imperial titles: Emperor Joseph I created him a Prince of the Holy Roman Empire in 1704, and in 1705, he was created Imperial Prince of Mindelheim ( once the lordship of the noted soldier Georg von Frundsberg ).

However, he was obliged to surrender Mindelheim in 1714 by the Treaty of Utrecht, which returned it to Bavaria.

According to some sources, he received the principality of Mellenburg in exchange.

Regardless, his Imperial titles did not pass to his daughters ( the Empire operated Salic Law which prevented female succession ), so became extinct on his death in 1722.